Does it work with a rotary phone?

Yes Rotary phones work with Cell2Jack.

Rotary phones pair on their own. After you power up Cell2Jack, it starts pairing by itself within about 2 minutes. You do not need to press #*# or enter 0000.

If the rotary phone will not ring

Most rotary phones are more than ten years old, so their ringer may be worn, weak, or wired in an old way. Some need the bias spring moved, or the ground wire changed, to ring again.

If you cannot get the old ringer to work, the simple fix is a cheap external ringer, which the maker says costs around 5 dollars.